I was using older version of WordPress on Ubuntu 16.04. Now when I try to upgrade to WordPress 4.9.5, it says
Unpacking the update... The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.: wp-admin/includes/update-core.php Installation Failed An automated WordPress update has failed to complete
And the plugin upgrade showing
Unable to update WordPress installation/plugins: The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions
Then I changed the owner and group owner to www-data user using below command.
sudo chown -R www-data:www-data /home/username/www/wordpress
After running above command I was able to successfully update WordPress with no further issues.
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After running the command, Whenever I open wordpress, all the folders in it are displayed with a lock icon.
Therefore, when i edit files, its keep asking me to enter root password. This issue fixed by running the below command
sudo chmod 777 -R /home/username/www/wordpress